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Real Estate Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 Investment | Jun. 30, 2013 | Jun. 30, 2014 Investment | Jun. 30, 2013 | Dec. 31, 2013 Investment
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | $ 173,281,000 |  | $ 173,281,000 |  | $ 124,555,000
Number of AFS securities | 306 |  | 306 |  | 303
Number of securities in unrealized loss position | 44 |  | 44 |  | 76
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | 16 |  | 16 |  | 5
Gross unrealized losses on AFS securities | 7,000,000 |  | 7,000,000 |  |
Other than temporary impairment loss on AFS securities | 3,000,000 |  |  |  |
Income Statement, other-than-temporary impairments | 264,000 |  | 377,000 |  |
Accumulated other comprehensive income, other-than-temporary impairments | 2,651,000 | 0 | 4,208,000 | 0 |
Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 167,691,000 |  | 167,691,000 |  | 119,575,000
Interest Only Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 105,000,000 |  | 105,000,000 |  |
Residential Senior and Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 62,000,000 |  | 62,000,000 |  |
Residential Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 6,000,000 |  | 6,000,000 |  |
Prime | Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 159,311,000 |  | 159,311,000 |  | 110,505,000
Securities financed through non-recourse resecuritization entity | 119,000,000 |  | 119,000,000 |  | 131,000,000
Non-prime | Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 8,380,000 |  | 8,380,000 |  | 9,070,000
Securities financed through non-recourse resecuritization entity | 127,000,000 |  | 127,000,000 |  | 132,000,000
Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Marketable securities, due from five to ten years | 2,000,000 |  | 2,000,000 |  |
Marketable securities, less than five years | 10,000 |  | 10,000 |  |
Trading Securities | Residential Senior and Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 62,000,000 |  | 62,000,000 |  |
Trading Securities | Residential Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | $ 15,000,000 |  | $ 15,000,000 |  |

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